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April 2, 1946. P L, MAYHEW 2,397.877

PERPETUAL CLEDAR Fi-1ed Jan. 24, 1944 `2 Sheng-sheet 1 ATTYS 2 Sheets-Sheet 2 P. L. MAYHEW PERPETUAL CALENDAR Filed Jan. 24, 1944 April z, 194.6.

lNvlENTOR PL-Mag/bew Y will r/LLL TTYS Patented Apr. 2, 1946 yuNrrin sTAra s rarest OFFICE' rERrE'rUAL CALENDAR Y Philip L. Mayhew, Modeste, Calif. Application January 2li, 1944, Serial No. 519,440 1 claim. (ci. re-4169 This invention relates to a perpetual calendar, my principal object being to provide a calendar of this type so arranged that the correct monthly calendar arrangement for anyone of a great manyyears maybe easily obtained by simply shifting a slidable panel. l i y Y Another object is to yprovide an index arrange. ment todeterrnin'ethe shifting of the panel so that no calculations on the part of the operator are necessary in nding the calendar for any desired year.

A further object of the invention is to produce a simple and inexpensive device, and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claim.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is an elevation of my improved calendar showing the index face thereof.

Figure 2 is a transverse section on the line 2--2 of Fig. 1.

Figure 3 is an elevation of the calendar showing the calendar side thereof, partly broken out.

Figure 4 is an elevation of the slide, detached.

Referring now more particularly to the characters of reference on the drawings, the device comprises a rectangular body I which, for convenience of manufacture, may be made up o-f a number of panels arranged as laminations suitably secured together about their periphery.

One face panel 2 is provided with a rectangular window 3 exposing one face portion of the adjacent panel 4, the exposed face of said panel having a list of years printed thereon, as at 5, with van index symbol 6 afterl each year, seven different symbols being suflicient to carry the calendar over any period of time. standard or normal years is preferably separated from the list of leap years, as shown.

On the back of the panel 4 are printed two sets of monthly calendars suitably spaced and arranged in rows in vertically spaced relation as at 1 and Il; the set 1 being for normal or standard years and the set 8 for leap years.

As shown in Fig. 3, each calendar set 1 or 8 consists of such a pre-calculated arrangement of numbers in thirteen vertical rows that if any six vertical rows from either or both ends of the calendar are covered, the seven remaining rows will correctly denote the days of a month in proper The list ofY sequence or conventional order. All the calendars 1 and` 8.areof co-urse figured so that from month to month .they will read in proper order when the corresponding rows A of different calendars are covered or blocked olf.

In order to thus cover six selected vertical rows of all the calendars simultaneously, a horizontally s lidablepanel Q iscmounted'in the'body back of thepanel-AL-A lAssuming thateach set of calendars 1, and which consists of twelve monthly units, are arranged in vertical rows of four months each, the panel is provided with horizontally spaced Windows III, each the height of all four calendar units and of a width equal to seven vertical rows of numbers on each unit. Similar windows I I are provided in the panel 9 to aline with the units of the calendar set 8. The vertical division webs I2 between the windows III and I I are marked along one edge with symbols indicating the months of the year, as at I3, while the horizontal division Webs I4 between the windows IIJ and I I are marked to indicate the days of the week, as at I5.

Another vertical slide panel I 6 is mounted in the body to cover either the top or bottom portion of the panel 9 and the corresponding exposed calendar, so that only the calendar set 1 or the calendar set 8 at a time are visible.

The slide I6 is disposed between a panel I1 and the back panel I8 of the body, said panels I1 and I8 having windows I9 therein of sufficient size to expose all the calendars and the adjacent portions of the slide panel 9. rIhe slide I6 may have a iinger engaging element 2B on its back face for manipulating the same, or any other suitable control means may be provided.

In order to slide the panel 9, the same is pro- Y vided on top of the body with a finger piece 2l.

In order to be able to readily set the panel 9 for any desired year the panel I is provided on its outer face with a horizontal row of stops, such as indentations 22, each marked with one of the indicia 5, as vshown at 23, the stops being spaced horizontally the same as the horizontal spacing of the adjacent vertical rows of figures on the calendars 1 or il. A pointer 24 depends from the finger-piece 2I and overlaps the stops 22, having an element 25 to engage any stop in cooperating relation.

The position of the slide 9 relative to the calendars thus obtained is, by reason of the indicia co-related with any listed year having the corresponding indicia, which is of course previously determined to be correct for the calendar then exposed by the slide 9.

In the illustration shown for instance, it is assumed that* the user desires to inspect the calendar for the year 1938. Noting from the index that this year bears the symbol G, the operator shifts the panel 9 so that the pointer .24 alines with the symbol G along the row of stops and then turns the body over. The calendar then exposed Y will be the correct one for 1938. The same setting of the slide 9 is obtained for certain other f years, as for instance the leap year 1944 (as will be evident by an` inspection of the index list.- ing), which has the symbol G opposite that year. In this case, however, the user on turning the body over iirst raises the slide I6 to expose the leap-year calendar set 8.

From the foregoing description it will be readily seen that I have produced such. a device; as substantially fulfills the objects of the in-` vention as set forth herein.

While this specification sets forth in detail the i unit consisting of thirteenfvertical horizontally spaced rows of figures denoting ther days of a month and arranged so that any seven consecutive rows of figures will include the days of a single month arranged in predetermined order, a listing of years also being associated with the panel and each year in the list having an identifying symbol, corresponding symbols associated with the panel adjacent one edge thereof, a horizontally shiftable slide mounted on the panel and having windows spaced apart'to correspond to the spacing of the calendar units, the width of the openings being such as to uncover only seven vertical rows of figures in the calendar unit at a' time, the symbols associated with the panel being spaced apart substantially the same distance as the spacing between the respective vertical rowsl of gures, a finger piece attached to oneedgev of the slide and extending outsideV of and along the edge of the panel adjacent which the year symbols are disposed, a pointerA onthe finger piece and overhanglng the edge of the panel to a point' adjacent said symbols, the panel being provided with an indentation adjacent each symbol and the pointer including an element to frictionally engage such indentations as the pointer is moved with the slide,k I

PHILIP L. MAYHIEW. 

